Rewrite aboot-deploy in C

aboot-deploy is being executed during the boot, so it might be safer to have a binary providing those features instead of a shell script.

Additional requirements/suggestions:

• Rewrite functionality of the current tool in C
• Use C library calls isntead of command line tools invocations where appropriate
• Use meson as a build tools to align with other newer AutoSD projects
• Provide some basic functionality tests (including valgrind execution?)